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Protection Equipment Matching

Match List-I (Equipment) with List-II (Application) and select the correct answer using the code given below the lists: List-I List-II a. Metal oxide arrester 1. Protects generator against short circuit faults b. Isolator 2. Improves transient stability c. Auto-recloser 3. Allows circuit breaker maintenance d. Differential relay 4. Provides protection against surges Codes: a b c d
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Answer & Explanation
Correct AnswerA. 4 3 2 1

Quick Explanation

A metal-oxide arrester protects against surges; an isolator provides visible isolation so equipment such as a circuit breaker can be maintained; an auto-recloser improves continuity/transient stability by rapidly restoring a line after transient faults; and a differential relay provides internal short-circuit protection for generators/transformers. This mapping corresponds to code A.

Formula / Key Relation

Arrester→surge; Isolator→maintenance isolation; Recloser→restore after transient fault; Differential relay→internal fault
Protection Equipment Matching explanatory diagram

Detailed Explanation

Correct Answer

A — 4 3 2 1

Concept and Reasoning

A metal-oxide arrester protects against surges; an isolator provides visible isolation so equipment such as a circuit breaker can be maintained; an auto-recloser improves continuity/transient stability by rapidly restoring a line after transient faults; and a differential relay provides internal short-circuit protection for generators/transformers. This mapping corresponds to code A.

Calculation / Key Relation

Arrester→surge

Isolator→maintenance isolation

Recloser→restore after transient fault

Differential relay→internal fault

Exam Takeaway

Match each device to its physical job before reading the code table.

Common Mistake

Do not treat an isolator as a fault-interrupting circuit breaker.

Quick Trick

Match each device to its physical job before reading the code table.

Common Mistake

Do not treat an isolator as a fault-interrupting circuit breaker.

Exam Tip

Match each device to its physical job before reading the code table.

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